libam7xxx  0.1
Communication library for Actions Micro AM7XXX based USB projectors and DPFs
am7xxx.c
1 /* am7xxx - communication with AM7xxx based USB Pico Projectors and DPFs
2  *
3  * Copyright (C) 2012-2014 Antonio Ospite <ao2@ao2.it>
4  *
5  * This program is free software: you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License as published by
7  * the Free Software Foundation, either version 2 of the License, or
8  * (at your option) any later version.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License
16  * along with this program. If not, see <http://www.gnu.org/licenses/>.
17  */
18 
19 #include <stdio.h>
20 #include <stdlib.h>
21 #include <string.h>
22 #include <stdarg.h>
23 #include <errno.h>
24 #include <libusb.h>
25 #include <math.h>
26 
27 #include "am7xxx.h"
28 #include "serialize.h"
29 #include "tools.h"
30 
31 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
32 
33 /*
34  * If we're not using GNU C, elide __attribute__
35  * taken from: http://unixwiz.net/techtips/gnu-c-attributes.html)
36  */
37 #ifndef __GNUC__
38  #define __attribute__(x) /* NOTHING */
39 #endif
40 
41 /*
42  * Fix printf format when compiling for Windows with MinGW, see:
43  * https://sourceforge.net/p/mingw-w64/wiki2/gnu%20printf/
44  */
45 #ifdef __MINGW_PRINTF_FORMAT
46  #define AM7XXX_PRINTF_FORMAT __MINGW_PRINTF_FORMAT
47 #else
48  #define AM7XXX_PRINTF_FORMAT printf
49 #endif
50 
51 /* Control shared library symbols visibility */
52 #if defined _WIN32 || defined __CYGWIN__
53  #define AM7XXX_PUBLIC __declspec(dllexport)
54  #define AM7XXX_LOCAL
55 #else
56  #if __GNUC__ >= 4
57  #define AM7XXX_PUBLIC __attribute__ ((visibility ("default")))
58  #define AM7XXX_LOCAL __attribute__ ((visibility ("hidden")))
59  #else
60  #define AM7XXX_PUBLIC
61  #define AM7XXX_LOCAL
62  #endif
63 #endif
64 
65 static void log_message(am7xxx_context *ctx,
66  int level,
67  const char *function_name,
68  int line,
69  const char *fmt,
70  ...) __attribute__ ((format (AM7XXX_PRINTF_FORMAT, 5, 6)));
71 
72 #define fatal(...) log_message(NULL, AM7XXX_LOG_FATAL, __func__, __LINE__, __VA_ARGS__)
73 #define error(ctx, ...) log_message(ctx, AM7XXX_LOG_ERROR, __func__, __LINE__, __VA_ARGS__)
74 #define warning(ctx, ...) log_message(ctx, AM7XXX_LOG_WARNING, __func__, 0, __VA_ARGS__)
75 #define info(ctx, ...) log_message(ctx, AM7XXX_LOG_INFO, __func__, 0, __VA_ARGS__)
76 #define debug(ctx, ...) log_message(ctx, AM7XXX_LOG_DEBUG, __func__, 0, __VA_ARGS__)
77 #define trace(ctx, ...) log_message(ctx, AM7XXX_LOG_TRACE, NULL, 0, __VA_ARGS__)
78 
79 struct am7xxx_ops {
80  int (*set_power_mode)(am7xxx_device *dev, am7xxx_power_mode power);
81  int (*set_zoom_mode)(am7xxx_device *dev, am7xxx_zoom_mode zoom);
82 };
83 
84 struct am7xxx_usb_device_descriptor {
85  const char *name;
86  uint16_t vendor_id;
87  uint16_t product_id;
88  uint8_t configuration; /* The bConfigurationValue of the device */
89  uint8_t interface_number; /* The bInterfaceNumber of the device */
90  struct am7xxx_ops ops;
91 };
92 
93 static int default_set_power_mode(am7xxx_device *dev, am7xxx_power_mode power);
94 static int picopix_set_power_mode(am7xxx_device *dev, am7xxx_power_mode power);
95 static int default_set_zoom_mode(am7xxx_device *dev, am7xxx_zoom_mode zoom);
96 static int picopix_set_zoom_mode(am7xxx_device *dev, am7xxx_zoom_mode zoom);
97 
98 #define DEFAULT_OPS { \
99  .set_power_mode = default_set_power_mode, \
100  .set_zoom_mode = default_set_zoom_mode, \
101 }
102 
103 static const struct am7xxx_usb_device_descriptor supported_devices[] = {
104  {
105  .name = "Acer C110",
106  .vendor_id = 0x1de1,
107  .product_id = 0xc101,
108  .configuration = 2,
109  .interface_number = 0,
110  .ops = DEFAULT_OPS,
111  },
112  {
113  .name = "Acer C112",
114  .vendor_id = 0x1de1,
115  .product_id = 0x5501,
116  .configuration = 2,
117  .interface_number = 0,
118  .ops = DEFAULT_OPS,
119  },
120  {
121  .name ="Aiptek PocketCinema T25",
122  .vendor_id = 0x08ca,
123  .product_id = 0x2144,
124  .configuration = 2,
125  .interface_number = 0,
126  .ops = DEFAULT_OPS,
127  },
128  {
129  .name = "Philips/Sagemcom PicoPix 1020",
130  .vendor_id = 0x21e7,
131  .product_id = 0x000e,
132  .configuration = 2,
133  .interface_number = 0,
134  .ops = DEFAULT_OPS,
135  },
136  {
137  .name = "Philips/Sagemcom PicoPix 2055",
138  .vendor_id = 0x21e7,
139  .product_id = 0x0016,
140  .configuration = 2,
141  .interface_number = 0,
142  .ops = {
143  .set_power_mode = picopix_set_power_mode,
144  .set_zoom_mode = picopix_set_zoom_mode,
145  },
146  },
147  {
148  .name = "Philips/Sagemcom PicoPix 2330",
149  .vendor_id = 0x21e7,
150  .product_id = 0x0019,
151  .configuration = 1,
152  .interface_number = 0,
153  },
154 };
155 
156 /* The header size on the wire is known to be always 24 bytes, regardless of
157  * the memory configuration enforced by different architectures or compilers
158  * for struct am7xxx_header
159  */
160 #define AM7XXX_HEADER_WIRE_SIZE 24
161 
162 struct _am7xxx_device {
163  libusb_device_handle *usb_device;
164  struct libusb_transfer *transfer;
165  int transfer_completed;
166  uint8_t buffer[AM7XXX_HEADER_WIRE_SIZE];
167  am7xxx_device_info *device_info;
168  am7xxx_context *ctx;
169  const struct am7xxx_usb_device_descriptor *desc;
170  am7xxx_device *next;
171 };
172 
173 struct _am7xxx_context {
174  libusb_context *usb_context;
175  int log_level;
176  am7xxx_device *devices_list;
177 };
178 
179 typedef enum {
180  AM7XXX_PACKET_TYPE_DEVINFO = 0x01,
181  AM7XXX_PACKET_TYPE_IMAGE = 0x02,
182  AM7XXX_PACKET_TYPE_POWER = 0x04,
183  AM7XXX_PACKET_TYPE_ZOOM = 0x05,
184  AM7XXX_PACKET_TYPE_PICOPIX_POWER_LOW = 0x15,
185  AM7XXX_PACKET_TYPE_PICOPIX_POWER_MEDIUM = 0x16,
186  AM7XXX_PACKET_TYPE_PICOPIX_POWER_HIGH = 0x17,
187  AM7XXX_PACKET_TYPE_PICOPIX_ENABLE_TI = 0x18,
188  AM7XXX_PACKET_TYPE_PICOPIX_DISABLE_TI = 0x19,
189 } am7xxx_packet_type;
190 
191 struct am7xxx_generic_header {
192  uint32_t field0;
193  uint32_t field1;
194  uint32_t field2;
195  uint32_t field3;
196 };
197 
198 struct am7xxx_devinfo_header {
199  uint32_t native_width;
200  uint32_t native_height;
201  uint32_t unknown0;
202  uint32_t unknown1;
203 };
204 
205 struct am7xxx_image_header {
206  uint32_t format;
207  uint32_t width;
208  uint32_t height;
209  uint32_t image_size;
210 };
211 
212 struct am7xxx_power_header {
213  uint32_t bit2;
214  uint32_t bit1;
215  uint32_t bit0;
216 };
217 
218 struct am7xxx_zoom_header {
219  uint32_t bit1;
220  uint32_t bit0;
221 };
222 
223 /*
224  * Examples of packet headers:
225  *
226  * Image header:
227  * 02 00 00 00 00 10 3e 10 01 00 00 00 20 03 00 00 e0 01 00 00 53 E8 00 00
228  *
229  * Power header:
230  * 04 00 00 00 00 0c ff ff 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
231  */
232 
233 /* Direction of the communication from the host point of view */
234 #define AM7XXX_DIRECTION_OUT 0 /* host -> device */
235 #define AM7XXX_DIRECTION_IN 1 /* host <- device */
236 
237 struct am7xxx_header {
238  uint32_t packet_type;
239  uint8_t direction;
240  uint8_t header_data_len;
241  uint8_t unknown2;
242  uint8_t unknown3;
243  union {
244  struct am7xxx_generic_header data;
245  struct am7xxx_devinfo_header devinfo;
246  struct am7xxx_image_header image;
247  struct am7xxx_power_header power;
248  struct am7xxx_zoom_header zoom;
249  } header_data;
250 };
251 
252 
253 #ifdef DEBUG
254 static void debug_dump_generic_header(am7xxx_context *ctx, struct am7xxx_generic_header *g)
255 {
256  if (ctx == NULL || g == NULL)
257  return;
258 
259  debug(ctx, "Generic header:\n");
260  debug(ctx, "\tfield0: 0x%08x (%u)\n", g->field0, g->field0);
261  debug(ctx, "\tfield1: 0x%08x (%u)\n", g->field1, g->field1);
262  debug(ctx, "\tfield2: 0x%08x (%u)\n", g->field2, g->field2);
263  debug(ctx, "\tfield3: 0x%08x (%u)\n", g->field3, g->field3);
264 }
265 
266 static void debug_dump_devinfo_header(am7xxx_context *ctx, struct am7xxx_devinfo_header *d)
267 {
268  if (ctx == NULL || d == NULL)
269  return;
270 
271  debug(ctx, "Info header:\n");
272  debug(ctx, "\tnative_width: 0x%08x (%u)\n", d->native_width, d->native_width);
273  debug(ctx, "\tnative_height: 0x%08x (%u)\n", d->native_height, d->native_height);
274  debug(ctx, "\tunknown0: 0x%08x (%u)\n", d->unknown0, d->unknown0);
275  debug(ctx, "\tunknown1: 0x%08x (%u)\n", d->unknown1, d->unknown1);
276 }
277 
278 static void debug_dump_image_header(am7xxx_context *ctx, struct am7xxx_image_header *i)
279 {
280  if (ctx == NULL || i == NULL)
281  return;
282 
283  debug(ctx, "Image header:\n");
284  debug(ctx, "\tformat: 0x%08x (%u)\n", i->format, i->format);
285  debug(ctx, "\twidth: 0x%08x (%u)\n", i->width, i->width);
286  debug(ctx, "\theight: 0x%08x (%u)\n", i->height, i->height);
287  debug(ctx, "\timage size: 0x%08x (%u)\n", i->image_size, i->image_size);
288 }
289 
290 static void debug_dump_power_header(am7xxx_context *ctx, struct am7xxx_power_header *p)
291 {
292  if (ctx == NULL || p == NULL)
293  return;
294 
295  debug(ctx, "Power header:\n");
296  debug(ctx, "\tbit2: 0x%08x (%u)\n", p->bit2, p->bit2);
297  debug(ctx, "\tbit1: 0x%08x (%u)\n", p->bit1, p->bit1);
298  debug(ctx, "\tbit0: 0x%08x (%u)\n", p->bit0, p->bit0);
299 }
300 
301 static void debug_dump_zoom_header(am7xxx_context *ctx, struct am7xxx_zoom_header *z)
302 {
303  if (ctx == NULL || z == NULL)
304  return;
305 
306  debug(ctx, "Zoom header:\n");
307  debug(ctx, "\tbit1: 0x%08x (%u)\n", z->bit1, z->bit1);
308  debug(ctx, "\tbit0: 0x%08x (%u)\n", z->bit0, z->bit0);
309 }
310 
311 static void debug_dump_header(am7xxx_context *ctx, struct am7xxx_header *h)
312 {
313  if (ctx == NULL || h == NULL)
314  return;
315 
316  debug(ctx, "BEGIN\n");
317  debug(ctx, "packet_type: 0x%08x (%u)\n", h->packet_type, h->packet_type);
318  debug(ctx, "direction: 0x%02hhx (%hhu) (%s)\n", h->direction, h->direction,
319  h->direction == AM7XXX_DIRECTION_IN ? "IN" :
320  h->direction == AM7XXX_DIRECTION_OUT ? "OUT" :
321  "UNKNOWN");
322  debug(ctx, "header_data_len: 0x%02hhx (%hhu)\n", h->header_data_len, h->header_data_len);
323  debug(ctx, "unknown2: 0x%02hhx (%hhu)\n", h->unknown2, h->unknown2);
324  debug(ctx, "unknown3: 0x%02hhx (%hhu)\n", h->unknown3, h->unknown3);
325 
326  switch(h->packet_type) {
327  case AM7XXX_PACKET_TYPE_DEVINFO:
328  debug_dump_devinfo_header(ctx, &(h->header_data.devinfo));
329  break;
330 
331  case AM7XXX_PACKET_TYPE_IMAGE:
332  debug_dump_image_header(ctx, &(h->header_data.image));
333  break;
334 
335  case AM7XXX_PACKET_TYPE_POWER:
336  debug_dump_power_header(ctx, &(h->header_data.power));
337  break;
338 
339  case AM7XXX_PACKET_TYPE_ZOOM:
340  debug_dump_zoom_header(ctx, &(h->header_data.zoom));
341  break;
342 
343  default:
344  debug(ctx, "Parsing data not supported for this packet type!\n");
345  debug_dump_generic_header(ctx, &(h->header_data.data));
346  break;
347  }
348  debug(ctx, "END\n\n");
349 }
350 
351 static inline unsigned int in_80chars(unsigned int i)
352 {
353  /* The 3 below is the length of "xx " where xx is the hex string
354  * representation of a byte */
355  return ((i + 1) % (80 / 3));
356 }
357 
358 static void trace_dump_buffer(am7xxx_context *ctx, const char *message,
359  uint8_t *buffer, unsigned int len)
360 {
361  unsigned int i;
362 
363  if (ctx == NULL || buffer == NULL || len == 0)
364  return;
365 
366  trace(ctx, "\n");
367  if (message)
368  trace(ctx, "%s\n", message);
369 
370  for (i = 0; i < len; i++) {
371  trace(ctx, "%02hhX%c", buffer[i], (in_80chars(i) && (i < len - 1)) ? ' ' : '\n');
372  }
373  trace(ctx, "\n");
374 }
375 #else
376 static void debug_dump_header(am7xxx_context *ctx, struct am7xxx_header *h)
377 {
378  (void)ctx;
379  (void)h;
380 }
381 
382 static void trace_dump_buffer(am7xxx_context *ctx, const char *message,
383  uint8_t *buffer, unsigned int len)
384 {
385  (void)ctx;
386  (void)message;
387  (void)buffer;
388  (void)len;
389 }
390 #endif /* DEBUG */
391 
392 static int read_data(am7xxx_device *dev, uint8_t *buffer, unsigned int len)
393 {
394  int ret;
395  int transferred;
396 
397  transferred = 0;
398  ret = libusb_bulk_transfer(dev->usb_device, 0x81, buffer, len, &transferred, 0);
399  if (ret != 0 || (unsigned int)transferred != len) {
400  error(dev->ctx, "%s. Transferred: %d (expected %u)\n",
401  libusb_error_name(ret), transferred, len);
402  return ret;
403  }
404 
405  trace_dump_buffer(dev->ctx, "<-- received", buffer, len);
406 
407  return 0;
408 }
409 
410 static int send_data(am7xxx_device *dev, uint8_t *buffer, unsigned int len)
411 {
412  int ret;
413  int transferred;
414 
415  trace_dump_buffer(dev->ctx, "sending -->", buffer, len);
416 
417  transferred = 0;
418  ret = libusb_bulk_transfer(dev->usb_device, 0x1, buffer, len, &transferred, 0);
419  if (ret != 0 || (unsigned int)transferred != len) {
420  error(dev->ctx, "%s. Transferred: %d (expected %u)\n",
421  libusb_error_name(ret), transferred, len);
422  return ret;
423  }
424 
425  return 0;
426 }
427 
428 static void LIBUSB_CALL send_data_async_complete_cb(struct libusb_transfer *transfer)
429 {
430  am7xxx_device *dev = (am7xxx_device *)(transfer->user_data);
431  int *completed = &(dev->transfer_completed);
432  int transferred = transfer->actual_length;
433  int ret;
434 
435  if (transferred != transfer->length) {
436  error(dev->ctx, "transferred: %d (expected %u)\n",
437  transferred, transfer->length);
438  }
439 
440  switch (transfer->status) {
441  case LIBUSB_TRANSFER_COMPLETED:
442  ret = 0;
443  break;
444  case LIBUSB_TRANSFER_TIMED_OUT:
445  ret = LIBUSB_ERROR_TIMEOUT;
446  break;
447  case LIBUSB_TRANSFER_STALL:
448  ret = LIBUSB_ERROR_PIPE;
449  break;
450  case LIBUSB_TRANSFER_OVERFLOW:
451  ret = LIBUSB_ERROR_OVERFLOW;
452  break;
453  case LIBUSB_TRANSFER_NO_DEVICE:
454  ret = LIBUSB_ERROR_NO_DEVICE;
455  break;
456  case LIBUSB_TRANSFER_ERROR:
457  case LIBUSB_TRANSFER_CANCELLED:
458  ret = LIBUSB_ERROR_IO;
459  break;
460  default:
461  error(dev->ctx, "unrecognised status code %d", transfer->status);
462  ret = LIBUSB_ERROR_OTHER;
463  }
464 
465  if (ret < 0)
466  error(dev->ctx, "libusb transfer failed: %s",
467  libusb_error_name(ret));
468 
469  libusb_free_transfer(transfer);
470  transfer = NULL;
471 
472  *completed = 1;
473 }
474 
475 static inline void wait_for_trasfer_completed(am7xxx_device *dev)
476 {
477  while (!dev->transfer_completed) {
478  int ret = libusb_handle_events_completed(dev->ctx->usb_context,
479  &(dev->transfer_completed));
480  if (ret < 0) {
481  if (ret == LIBUSB_ERROR_INTERRUPTED)
482  continue;
483  error(dev->ctx, "libusb_handle_events failed: %s, cancelling transfer and retrying",
484  libusb_error_name(ret));
485  libusb_cancel_transfer(dev->transfer);
486  continue;
487  }
488  }
489 }
490 
491 static int send_data_async(am7xxx_device *dev, uint8_t *buffer, unsigned int len)
492 {
493  int ret;
494  uint8_t *transfer_buffer;
495 
496  dev->transfer = libusb_alloc_transfer(0);
497  if (dev->transfer == NULL) {
498  error(dev->ctx, "cannot allocate transfer (%s)\n",
499  strerror(errno));
500  return -ENOMEM;
501  }
502 
503  /* Make a copy of the buffer so the caller can safely reuse it just
504  * after libusb_submit_transfer() has returned. This technique
505  * requires more dynamic allocations compared to a proper
506  * double-buffering approach but it takes a lot less code. */
507  transfer_buffer = malloc(len);
508  if (transfer_buffer == NULL) {
509  error(dev->ctx, "cannot allocate transfer buffer (%s)\n",
510  strerror(errno));
511  ret = -ENOMEM;
512  goto err;
513  }
514  memcpy(transfer_buffer, buffer, len);
515 
516  dev->transfer->flags |= LIBUSB_TRANSFER_FREE_BUFFER;
517  libusb_fill_bulk_transfer(dev->transfer, dev->usb_device, 0x1,
518  transfer_buffer, len,
519  send_data_async_complete_cb, dev, 0);
520 
521  /* wait for the previous transfer to complete */
522  wait_for_trasfer_completed(dev);
523 
524  trace_dump_buffer(dev->ctx, "sending -->", buffer, len);
525 
526  dev->transfer_completed = 0;
527  ret = libusb_submit_transfer(dev->transfer);
528  if (ret < 0)
529  goto err;
530 
531  return 0;
532 
533 err:
534  libusb_free_transfer(dev->transfer);
535  dev->transfer = NULL;
536  return ret;
537 }
538 
539 static void serialize_header(struct am7xxx_header *h, uint8_t *buffer)
540 {
541  uint8_t **buffer_iterator = &buffer;
542 
543  put_le32(h->packet_type, buffer_iterator);
544  put_8(h->direction, buffer_iterator);
545  put_8(h->header_data_len, buffer_iterator);
546  put_8(h->unknown2, buffer_iterator);
547  put_8(h->unknown3, buffer_iterator);
548  put_le32(h->header_data.data.field0, buffer_iterator);
549  put_le32(h->header_data.data.field1, buffer_iterator);
550  put_le32(h->header_data.data.field2, buffer_iterator);
551  put_le32(h->header_data.data.field3, buffer_iterator);
552 }
553 
554 static void unserialize_header(uint8_t *buffer, struct am7xxx_header *h)
555 {
556  uint8_t **buffer_iterator = &buffer;
557 
558  h->packet_type = get_le32(buffer_iterator);
559  h->direction = get_8(buffer_iterator);
560  h->header_data_len = get_8(buffer_iterator);
561  h->unknown2 = get_8(buffer_iterator);
562  h->unknown3 = get_8(buffer_iterator);
563  h->header_data.data.field0 = get_le32(buffer_iterator);
564  h->header_data.data.field1 = get_le32(buffer_iterator);
565  h->header_data.data.field2 = get_le32(buffer_iterator);
566  h->header_data.data.field3 = get_le32(buffer_iterator);
567 }
568 
569 static int read_header(am7xxx_device *dev, struct am7xxx_header *h)
570 {
571  int ret;
572 
573  ret = read_data(dev, dev->buffer, AM7XXX_HEADER_WIRE_SIZE);
574  if (ret < 0)
575  goto out;
576 
577  unserialize_header(dev->buffer, h);
578 
579  if (h->direction == AM7XXX_DIRECTION_IN) {
580  ret = 0;
581  } else {
582  error(dev->ctx,
583  "Expected an AM7XXX_DIRECTION_IN packet, got one with direction = %d. Weird!\n",
584  h->direction);
585  ret = -EINVAL;
586  }
587 
588  debug_dump_header(dev->ctx, h);
589 
590 out:
591  return ret;
592 }
593 
594 static int send_header(am7xxx_device *dev, struct am7xxx_header *h)
595 {
596  int ret;
597 
598  debug_dump_header(dev->ctx, h);
599 
600  /* For symmetry with read_header() we should check here for
601  * h->direction == AM7XXX_DIRECTION_OUT but we just ensure that in all
602  * the callers and save some cycles here.
603  */
604 
605  serialize_header(h, dev->buffer);
606 
607  ret = send_data(dev, dev->buffer, AM7XXX_HEADER_WIRE_SIZE);
608  if (ret < 0)
609  error(dev->ctx, "failed to send data\n");
610 
611  return ret;
612 }
613 
614 static int send_command(am7xxx_device *dev, am7xxx_packet_type type)
615 {
616  struct am7xxx_header h = {
617  .packet_type = type,
618  .direction = AM7XXX_DIRECTION_OUT,
619  .header_data_len = 0x00,
620  .unknown2 = 0x3e,
621  .unknown3 = 0x10,
622  .header_data = {
623  .data = {
624  .field0 = 0,
625  .field1 = 0,
626  .field2 = 0,
627  .field3 = 0,
628  },
629  },
630  };
631 
632  return send_header(dev, &h);
633 }
634 
635 
636 /* When level == AM7XXX_LOG_FATAL do not check the log_level from the context
637  * and print the message unconditionally, this makes it possible to print
638  * fatal messages even early on initialization, before the context has been
639  * set up */
640 static void log_message(am7xxx_context *ctx,
641  int level,
642  const char *function_name,
643  int line,
644  const char *fmt,
645  ...)
646 {
647  va_list ap;
648 
649  if (level == AM7XXX_LOG_FATAL || (ctx && level <= ctx->log_level)) {
650  if (function_name) {
651  fprintf(stderr, "%s", function_name);
652  if (line)
653  fprintf(stderr, "[%d]", line);
654  fprintf(stderr, ": ");
655  }
656 
657  va_start(ap, fmt);
658  vfprintf(stderr, fmt, ap);
659  va_end(ap);
660  }
661 
662  return;
663 }
664 
665 static am7xxx_device *add_new_device(am7xxx_context *ctx,
666  const struct am7xxx_usb_device_descriptor *desc)
667 {
668  am7xxx_device **devices_list;
669  am7xxx_device *new_device;
670 
671  if (ctx == NULL) {
672  fatal("context must not be NULL!\n");
673  return NULL;
674  }
675 
676  new_device = malloc(sizeof(*new_device));
677  if (new_device == NULL) {
678  debug(ctx, "cannot allocate a new device (%s)\n", strerror(errno));
679  return NULL;
680  }
681  memset(new_device, 0, sizeof(*new_device));
682 
683  new_device->ctx = ctx;
684  new_device->desc = desc;
685  new_device->transfer_completed = 1;
686 
687  devices_list = &(ctx->devices_list);
688 
689  if (*devices_list == NULL) {
690  *devices_list = new_device;
691  } else {
692  am7xxx_device *prev = *devices_list;
693  while (prev->next)
694  prev = prev->next;
695  prev->next = new_device;
696  }
697  return new_device;
698 }
699 
700 static am7xxx_device *find_device(am7xxx_context *ctx,
701  unsigned int device_index)
702 {
703  unsigned int i = 0;
704  am7xxx_device *current;
705 
706  if (ctx == NULL) {
707  fatal("context must not be NULL!\n");
708  return NULL;
709  }
710 
711  current = ctx->devices_list;
712  while (current && i++ < device_index)
713  current = current->next;
714 
715  return current;
716 }
717 
718 static int open_device(am7xxx_context *ctx,
719  unsigned int device_index,
720  libusb_device *usb_dev,
721  am7xxx_device **dev)
722 {
723  int ret;
724  int current_configuration;
725 
726  *dev = find_device(ctx, device_index);
727  if (*dev == NULL) {
728  ret = -ENODEV;
729  goto out;
730  }
731 
732  /* the usb device has already been opened */
733  if ((*dev)->usb_device) {
734  ret = 1;
735  goto out;
736  }
737 
738  ret = libusb_open(usb_dev, &((*dev)->usb_device));
739  if (ret < 0) {
740  debug(ctx, "libusb_open failed: %s\n", libusb_error_name(ret));
741  goto out;
742  }
743 
744  /* XXX, the device is now open, if any of the calls below fail we need
745  * to close it again before bailing out.
746  */
747 
748  current_configuration = -1;
749  ret = libusb_get_configuration((*dev)->usb_device,
750  &current_configuration);
751  if (ret < 0) {
752  debug(ctx, "libusb_get_configuration failed: %s\n",
753  libusb_error_name(ret));
754  goto out_libusb_close;
755  }
756 
757  if (current_configuration != (*dev)->desc->configuration) {
758  /*
759  * In principle, before setting a new configuration, kernel
760  * drivers should be detached from _all_ interfaces; for
761  * example calling something like the following "invented"
762  * function _before_ setting the new configuration:
763  *
764  * libusb_detach_all_kernel_drivers((*dev)->usb_device);
765  *
766  * However, in practice, this is not necessary for most
767  * devices as they have only one configuration.
768  *
769  * When a device only has one configuration:
770  *
771  * - if there was a kernel driver bound to the device, it
772  * had already set the configuration and the call below
773  * will be skipped;
774  *
775  * - if no kernel driver was bound to the device, the call
776  * below will suceed.
777  */
778  ret = libusb_set_configuration((*dev)->usb_device,
779  (*dev)->desc->configuration);
780  if (ret < 0) {
781  debug(ctx, "libusb_set_configuration failed: %s\n",
782  libusb_error_name(ret));
783  debug(ctx, "Cannot set configuration %hhu\n",
784  (*dev)->desc->configuration);
785  goto out_libusb_close;
786  }
787  }
788 
789  libusb_set_auto_detach_kernel_driver((*dev)->usb_device, 1);
790 
791  ret = libusb_claim_interface((*dev)->usb_device,
792  (*dev)->desc->interface_number);
793  if (ret < 0) {
794  debug(ctx, "libusb_claim_interface failed: %s\n",
795  libusb_error_name(ret));
796  debug(ctx, "Cannot claim interface %hhu\n",
797  (*dev)->desc->interface_number);
798  goto out_libusb_close;
799  }
800 
801  /* Checking that the configuration has not changed, as suggested in
802  * http://libusb.sourceforge.net/api-1.0/caveats.html
803  */
804  current_configuration = -1;
805  ret = libusb_get_configuration((*dev)->usb_device,
806  &current_configuration);
807  if (ret < 0) {
808  debug(ctx, "libusb_get_configuration after claim failed: %s\n",
809  libusb_error_name(ret));
810  goto out_libusb_release_interface;
811  }
812 
813  if (current_configuration != (*dev)->desc->configuration) {
814  debug(ctx, "libusb configuration changed (expected: %hhu, current: %d)\n",
815  (*dev)->desc->configuration, current_configuration);
816  ret = -EINVAL;
817  goto out_libusb_release_interface;
818  }
819 out:
820  return ret;
821 
822 out_libusb_release_interface:
823  libusb_release_interface((*dev)->usb_device,
824  (*dev)->desc->interface_number);
825 out_libusb_close:
826  libusb_close((*dev)->usb_device);
827  (*dev)->usb_device = NULL;
828  return ret;
829 }
830 
831 typedef enum {
832  SCAN_OP_BUILD_DEVLIST,
833  SCAN_OP_OPEN_DEVICE,
834 } scan_op;
835 
854 static int scan_devices(am7xxx_context *ctx, scan_op op,
855  unsigned int open_device_index, am7xxx_device **dev)
856 {
857  ssize_t num_devices;
858  libusb_device **list;
859  unsigned int current_index;
860  int i;
861  int ret;
862 
863  if (ctx == NULL) {
864  fatal("context must not be NULL!\n");
865  return -EINVAL;
866  }
867  if (op == SCAN_OP_BUILD_DEVLIST && ctx->devices_list != NULL) {
868  error(ctx, "device scan done already? Abort!\n");
869  return -EINVAL;
870  }
871 
872  num_devices = libusb_get_device_list(ctx->usb_context, &list);
873  if (num_devices < 0) {
874  ret = -ENODEV;
875  goto out;
876  }
877 
878  current_index = 0;
879  for (i = 0; i < num_devices; i++) {
880  struct libusb_device_descriptor desc;
881  unsigned int j;
882 
883  ret = libusb_get_device_descriptor(list[i], &desc);
884  if (ret < 0)
885  continue;
886 
887  for (j = 0; j < ARRAY_SIZE(supported_devices); j++) {
888  if (desc.idVendor == supported_devices[j].vendor_id &&
889  desc.idProduct == supported_devices[j].product_id) {
890 
891  if (op == SCAN_OP_BUILD_DEVLIST) {
892  am7xxx_device *new_device;
893  info(ctx, "am7xxx device found, index: %d, name: %s\n",
894  current_index,
895  supported_devices[j].name);
896  new_device = add_new_device(ctx, &supported_devices[j]);
897  if (new_device == NULL) {
898  /* XXX, the caller may want
899  * to call am7xxx_shutdown() if
900  * we fail here, as we may have
901  * added some devices already
902  */
903  debug(ctx, "Cannot create a new device\n");
904  ret = -ENODEV;
905  goto out;
906  }
907  } else if (op == SCAN_OP_OPEN_DEVICE &&
908  current_index == open_device_index) {
909 
910  ret = open_device(ctx,
911  open_device_index,
912  list[i],
913  dev);
914  if (ret < 0)
915  debug(ctx, "open_device failed\n");
916 
917  /* exit the loop unconditionally after
918  * attempting to open the device
919  * requested by the user */
920  goto out;
921  }
922  current_index++;
923  }
924  }
925  }
926 
927  /* if we made it up to here when op == SCAN_OP_OPEN_DEVICE,
928  * no devices to open had been found. */
929  if (op == SCAN_OP_OPEN_DEVICE) {
930  error(ctx, "Cannot find any device to open\n");
931  ret = -ENODEV;
932  goto out;
933  }
934 
935  /* everything went fine when building the device list */
936  ret = 0;
937 out:
938  libusb_free_device_list(list, 1);
939  return ret;
940 }
941 
942 /* Device specific operations */
943 
944 static int default_set_power_mode(am7xxx_device *dev, am7xxx_power_mode power)
945 {
946  int ret;
947  struct am7xxx_header h = {
948  .packet_type = AM7XXX_PACKET_TYPE_POWER,
949  .direction = AM7XXX_DIRECTION_OUT,
950  .header_data_len = sizeof(struct am7xxx_power_header),
951  .unknown2 = 0x3e,
952  .unknown3 = 0x10,
953  };
954 
955  switch(power) {
956  case AM7XXX_POWER_OFF:
957  h.header_data.power.bit2 = 0;
958  h.header_data.power.bit1 = 0;
959  h.header_data.power.bit0 = 0;
960  break;
961 
962  case AM7XXX_POWER_LOW:
963  h.header_data.power.bit2 = 0;
964  h.header_data.power.bit1 = 0;
965  h.header_data.power.bit0 = 1;
966  break;
967 
968  case AM7XXX_POWER_MIDDLE:
969  h.header_data.power.bit2 = 0;
970  h.header_data.power.bit1 = 1;
971  h.header_data.power.bit0 = 0;
972  break;
973 
974  case AM7XXX_POWER_HIGH:
975  h.header_data.power.bit2 = 0;
976  h.header_data.power.bit1 = 1;
977  h.header_data.power.bit0 = 1;
978  break;
979 
980  case AM7XXX_POWER_TURBO:
981  h.header_data.power.bit2 = 1;
982  h.header_data.power.bit1 = 0;
983  h.header_data.power.bit0 = 0;
984  break;
985 
986  default:
987  error(dev->ctx, "Unsupported power mode.\n");
988  return -EINVAL;
989  };
990 
991  ret = send_header(dev, &h);
992  if (ret < 0)
993  return ret;
994 
995  return 0;
996 }
997 
998 static int picopix_set_power_mode(am7xxx_device *dev, am7xxx_power_mode power)
999 {
1000  switch(power) {
1001  case AM7XXX_POWER_LOW:
1002  return send_command(dev, AM7XXX_PACKET_TYPE_PICOPIX_POWER_LOW);
1003 
1004  case AM7XXX_POWER_MIDDLE:
1005  return send_command(dev, AM7XXX_PACKET_TYPE_PICOPIX_POWER_MEDIUM);
1006 
1007  case AM7XXX_POWER_HIGH:
1008  return send_command(dev, AM7XXX_PACKET_TYPE_PICOPIX_POWER_HIGH);
1009 
1010  case AM7XXX_POWER_OFF:
1011  case AM7XXX_POWER_TURBO:
1012  default:
1013  error(dev->ctx, "Unsupported power mode.\n");
1014  return -EINVAL;
1015  };
1016 }
1017 
1018 static int default_set_zoom_mode(am7xxx_device *dev, am7xxx_zoom_mode zoom)
1019 {
1020  int ret;
1021  struct am7xxx_header h = {
1022  .packet_type = AM7XXX_PACKET_TYPE_ZOOM,
1023  .direction = AM7XXX_DIRECTION_OUT,
1024  .header_data_len = sizeof(struct am7xxx_zoom_header),
1025  .unknown2 = 0x3e,
1026  .unknown3 = 0x10,
1027  };
1028 
1029  switch(zoom) {
1030  case AM7XXX_ZOOM_ORIGINAL:
1031  h.header_data.zoom.bit1 = 0;
1032  h.header_data.zoom.bit0 = 0;
1033  break;
1034 
1035  case AM7XXX_ZOOM_H:
1036  h.header_data.zoom.bit1 = 0;
1037  h.header_data.zoom.bit0 = 1;
1038  break;
1039 
1040  case AM7XXX_ZOOM_H_V:
1041  h.header_data.zoom.bit1 = 1;
1042  h.header_data.zoom.bit0 = 0;
1043  break;
1044 
1045  case AM7XXX_ZOOM_TEST:
1046  h.header_data.zoom.bit1 = 1;
1047  h.header_data.zoom.bit0 = 1;
1048  break;
1049 
1050  case AM7XXX_ZOOM_TELE:
1051  default:
1052  error(dev->ctx, "Unsupported zoom mode.\n");
1053  return -EINVAL;
1054  };
1055 
1056  ret = send_header(dev, &h);
1057  if (ret < 0)
1058  return ret;
1059 
1060  return 0;
1061 }
1062 
1063 static int picopix_set_zoom_mode(am7xxx_device *dev, am7xxx_zoom_mode zoom)
1064 {
1065  int ret;
1066  am7xxx_packet_type packet_type;
1067 
1068  switch(zoom) {
1069  case AM7XXX_ZOOM_ORIGINAL:
1070  packet_type = AM7XXX_PACKET_TYPE_PICOPIX_DISABLE_TI;
1071  break;
1072 
1073  case AM7XXX_ZOOM_TELE:
1074  packet_type = AM7XXX_PACKET_TYPE_PICOPIX_ENABLE_TI;
1075  break;
1076 
1077  case AM7XXX_ZOOM_H:
1078  case AM7XXX_ZOOM_H_V:
1079  case AM7XXX_ZOOM_TEST:
1080  default:
1081  error(dev->ctx, "Unsupported zoom mode.\n");
1082  return -EINVAL;
1083  };
1084 
1085  ret = send_command(dev, packet_type);
1086  if (ret < 0)
1087  return ret;
1088 
1089  /* The Windows drivers wait for 100ms and send the same command again,
1090  * probably to overcome a firmware deficiency */
1091  ret = msleep(100);
1092  if (ret < 0)
1093  return ret;
1094 
1095  return send_command(dev, packet_type);
1096 }
1097 
1098 /* Public API */
1099 
1100 AM7XXX_PUBLIC int am7xxx_init(am7xxx_context **ctx)
1101 {
1102  int ret;
1103 
1104  *ctx = malloc(sizeof(**ctx));
1105  if (*ctx == NULL) {
1106  fatal("cannot allocate the context (%s)\n", strerror(errno));
1107  return -ENOMEM;
1108  }
1109  memset(*ctx, 0, sizeof(**ctx));
1110 
1111  /* Set the highest log level during initialization */
1112  (*ctx)->log_level = AM7XXX_LOG_TRACE;
1113 
1114  ret = libusb_init(&((*ctx)->usb_context));
1115  if (ret < 0) {
1116  error(*ctx, "libusb_init failed: %s\n", libusb_error_name(ret));
1117  goto out_free_context;
1118  }
1119 
1120  libusb_set_debug((*ctx)->usb_context, LIBUSB_LOG_LEVEL_INFO);
1121 
1122  ret = scan_devices(*ctx, SCAN_OP_BUILD_DEVLIST , 0, NULL);
1123  if (ret < 0) {
1124  error(*ctx, "scan_devices() failed\n");
1125  am7xxx_shutdown(*ctx);
1126  goto out;
1127  }
1128 
1129  /* Set a quieter log level as default for normal operation */
1130  (*ctx)->log_level = AM7XXX_LOG_ERROR;
1131  return 0;
1132 
1133 out_free_context:
1134  free(*ctx);
1135  *ctx = NULL;
1136 out:
1137  return ret;
1138 }
1139 
1140 AM7XXX_PUBLIC void am7xxx_shutdown(am7xxx_context *ctx)
1141 {
1142  am7xxx_device *current;
1143 
1144  if (ctx == NULL) {
1145  fatal("context must not be NULL!\n");
1146  return;
1147  }
1148 
1149  current = ctx->devices_list;
1150  while (current) {
1151  am7xxx_device *next = current->next;
1152  am7xxx_close_device(current);
1153  free(current->device_info);
1154  free(current);
1155  current = next;
1156  }
1157 
1158  libusb_exit(ctx->usb_context);
1159  free(ctx);
1160  ctx = NULL;
1161 }
1162 
1163 AM7XXX_PUBLIC void am7xxx_set_log_level(am7xxx_context *ctx, am7xxx_log_level log_level)
1164 {
1165  ctx->log_level = log_level;
1166 }
1167 
1168 AM7XXX_PUBLIC int am7xxx_open_device(am7xxx_context *ctx, am7xxx_device **dev,
1169  unsigned int device_index)
1170 {
1171  int ret;
1172 
1173  if (ctx == NULL) {
1174  fatal("context must not be NULL!\n");
1175  return -EINVAL;
1176  }
1177 
1178  ret = scan_devices(ctx, SCAN_OP_OPEN_DEVICE, device_index, dev);
1179  if (ret < 0) {
1180  errno = ENODEV;
1181  goto out;
1182  } else if (ret > 0) {
1183  warning(ctx, "device %d already open\n", device_index);
1184  errno = EBUSY;
1185  ret = -EBUSY;
1186  goto out;
1187  }
1188 
1189  /* Philips/Sagemcom PicoPix projectors require that the DEVINFO packet
1190  * is the first one to be sent to the device in order for it to
1191  * successfully return the correct device information.
1192  *
1193  * NOTE: am7xxx_get_device_info() will fetch the actual device info
1194  * from the device only the very first time it's called for a given
1195  * device, otherwise, it'll return a cached version of the device info
1196  * (from a previous call to am7xxx_open_device(), for instance).
1197  */
1198  ret = am7xxx_get_device_info(*dev, NULL);
1199  if (ret < 0)
1200  error(ctx, "cannot get device info\n");
1201 
1202 out:
1203  return ret;
1204 }
1205 
1206 AM7XXX_PUBLIC int am7xxx_close_device(am7xxx_device *dev)
1207 {
1208  if (dev == NULL) {
1209  fatal("dev must not be NULL!\n");
1210  return -EINVAL;
1211  }
1212  if (dev->usb_device) {
1213  wait_for_trasfer_completed(dev);
1214  libusb_release_interface(dev->usb_device, dev->desc->interface_number);
1215  libusb_close(dev->usb_device);
1216  dev->usb_device = NULL;
1217  }
1218  return 0;
1219 }
1220 
1221 AM7XXX_PUBLIC int am7xxx_get_device_info(am7xxx_device *dev,
1222  am7xxx_device_info *device_info)
1223 {
1224  int ret;
1225  struct am7xxx_header h;
1226 
1227  /* if there is a cached copy of the device info, just return that */
1228  if (dev->device_info)
1229  goto return_value;
1230 
1231  ret = send_command(dev, AM7XXX_PACKET_TYPE_DEVINFO);
1232  if (ret < 0)
1233  return ret;
1234 
1235  memset(&h, 0, sizeof(h));
1236  ret = read_header(dev, &h);
1237  if (ret < 0)
1238  return ret;
1239 
1240  if (h.packet_type != AM7XXX_PACKET_TYPE_DEVINFO) {
1241  error(dev->ctx, "expected packet type: %d, got %d instead!\n",
1242  AM7XXX_PACKET_TYPE_DEVINFO, h.packet_type);
1243  errno = EINVAL;
1244  return -EINVAL;
1245  }
1246 
1247  dev->device_info = malloc(sizeof(*dev->device_info));
1248  if (dev->device_info == NULL) {
1249  error(dev->ctx, "cannot allocate a device info (%s)\n",
1250  strerror(errno));
1251  return -ENOMEM;
1252  }
1253  memset(dev->device_info, 0, sizeof(*dev->device_info));
1254 
1255  dev->device_info->native_width = h.header_data.devinfo.native_width;
1256  dev->device_info->native_height = h.header_data.devinfo.native_height;
1257 #if 0
1258  /* No reason to expose these in the public API until we know what they mean */
1259  dev->device_info->unknown0 = h.header_data.devinfo.unknown0;
1260  dev->device_info->unknown1 = h.header_data.devinfo.unknown1;
1261 #endif
1262 
1263 return_value:
1264  if (device_info)
1265  memcpy(device_info, dev->device_info, sizeof(*device_info));
1266  return 0;
1267 }
1268 
1270  unsigned int upscale,
1271  unsigned int original_width,
1272  unsigned int original_height,
1273  unsigned int *scaled_width,
1274  unsigned int *scaled_height)
1275 {
1276  am7xxx_device_info device_info;
1277  float width_ratio;
1278  float height_ratio;
1279  int ret;
1280 
1281  ret = am7xxx_get_device_info(dev, &device_info);
1282  if (ret < 0) {
1283  error(dev->ctx, "cannot get device info\n");
1284  return ret;
1285  }
1286 
1287  /*
1288  * Check if we need to rescale; if the input image fits the native
1289  * dimensions there is no need to, unless we want to upscale.
1290  */
1291  if (!upscale &&
1292  original_width <= device_info.native_width &&
1293  original_height <= device_info.native_height ) {
1294  debug(dev->ctx, "CASE 0, no rescaling, the original image fits already\n");
1295  *scaled_width = original_width;
1296  *scaled_height = original_height;
1297  return 0;
1298  }
1299 
1300  /* Input dimensions relative to the device native dimensions */
1301  width_ratio = (float)original_width / device_info.native_width;
1302  height_ratio = (float)original_height / device_info.native_height;
1303 
1304  if (width_ratio > height_ratio) {
1305  /*
1306  * The input is proportionally "wider" than the device viewport
1307  * so its height needs to be adjusted
1308  */
1309  debug(dev->ctx, "CASE 1, original image wider, adjust the scaled height\n");
1310  *scaled_width = device_info.native_width;
1311  *scaled_height = (unsigned int)lroundf(original_height / width_ratio);
1312  } else if (width_ratio < height_ratio) {
1313  /*
1314  * The input is proportionally "taller" than the device viewport
1315  * so its width needs to be adjusted
1316  */
1317  debug(dev->ctx, "CASE 2 original image taller, adjust the scaled width\n");
1318  *scaled_width = (unsigned int)lroundf(original_width / height_ratio);
1319  *scaled_height = device_info.native_height;
1320  } else {
1321  debug(dev->ctx, "CASE 3, just rescale, same aspect ratio already\n");
1322  *scaled_width = device_info.native_width;
1323  *scaled_height = device_info.native_height;
1324  }
1325  debug(dev->ctx, "scaled dimensions: %dx%d\n", *scaled_width, *scaled_height);
1326 
1327  return 0;
1328 }
1329 
1330 AM7XXX_PUBLIC int am7xxx_send_image(am7xxx_device *dev,
1331  am7xxx_image_format format,
1332  unsigned int width,
1333  unsigned int height,
1334  uint8_t *image,
1335  unsigned int image_size)
1336 {
1337  int ret;
1338  struct am7xxx_header h = {
1339  .packet_type = AM7XXX_PACKET_TYPE_IMAGE,
1340  .direction = AM7XXX_DIRECTION_OUT,
1341  .header_data_len = sizeof(struct am7xxx_image_header),
1342  .unknown2 = 0x3e,
1343  .unknown3 = 0x10,
1344  .header_data = {
1345  .image = {
1346  .format = format,
1347  .width = width,
1348  .height = height,
1349  .image_size = image_size,
1350  },
1351  },
1352  };
1353 
1354  ret = send_header(dev, &h);
1355  if (ret < 0)
1356  return ret;
1357 
1358  if (image == NULL || image_size == 0) {
1359  warning(dev->ctx, "Not sending any data, check the 'image' or 'image_size' parameters\n");
1360  return 0;
1361  }
1362 
1363  return send_data(dev, image, image_size);
1364 }
1365 
1366 AM7XXX_PUBLIC int am7xxx_send_image_async(am7xxx_device *dev,
1367  am7xxx_image_format format,
1368  unsigned int width,
1369  unsigned int height,
1370  uint8_t *image,
1371  unsigned int image_size)
1372 {
1373  int ret;
1374  struct am7xxx_header h = {
1375  .packet_type = AM7XXX_PACKET_TYPE_IMAGE,
1376  .direction = AM7XXX_DIRECTION_OUT,
1377  .header_data_len = sizeof(struct am7xxx_image_header),
1378  .unknown2 = 0x3e,
1379  .unknown3 = 0x10,
1380  .header_data = {
1381  .image = {
1382  .format = format,
1383  .width = width,
1384  .height = height,
1385  .image_size = image_size,
1386  },
1387  },
1388  };
1389 
1390  ret = send_header(dev, &h);
1391  if (ret < 0)
1392  return ret;
1393 
1394  if (image == NULL || image_size == 0) {
1395  warning(dev->ctx, "Not sending any data, check the 'image' or 'image_size' parameters\n");
1396  return 0;
1397  }
1398 
1399  return send_data_async(dev, image, image_size);
1400 }
1401 
1403 {
1404  if (dev->desc->ops.set_power_mode == NULL) {
1405  warning(dev->ctx,
1406  "setting power mode is unsupported on this device\n");
1407  return 0;
1408  }
1409 
1410  return dev->desc->ops.set_power_mode(dev, power);
1411 }
1412 
1414 {
1415  if (dev->desc->ops.set_zoom_mode == NULL) {
1416  warning(dev->ctx,
1417  "setting zoom mode is unsupported on this device\n");
1418  return 0;
1419  }
1420 
1421  return dev->desc->ops.set_zoom_mode(dev, zoom);
1422 }
Zoom test screen, the firmware version is shown as well.
Definition: am7xxx.h:126
Zoom 1: H Scale (changes aspect ratio).
Definition: am7xxx.h:124
struct _am7xxx_context am7xxx_context
An opaque data type representing a context.
Definition: am7xxx.h:38
Zoom Tele: available on some PicoPix models.
Definition: am7xxx.h:127
A struct describing device specific properties.
Definition: am7xxx.h:56
int am7xxx_init(am7xxx_context **ctx)
Initialize the library context and data structures, and scan for devices.
Definition: am7xxx.c:1100
Original Size, as retrieved via am7xxx_device_info.
Definition: am7xxx.h:123
Max brightness and power consumption.
Definition: am7xxx.h:104
Middle level of brightness.
Definition: am7xxx.h:102
am7xxx_image_format
The image formats accepted by the device.
Definition: am7xxx.h:80
am7xxx_power_mode
The device power modes.
Definition: am7xxx.h:99
Public libam7xxx API.
int am7xxx_open_device(am7xxx_context *ctx, am7xxx_device **dev, unsigned int device_index)
Open an am7xxx_device according to a index.
Definition: am7xxx.c:1168
Zoom 2: H/V Scale (changes aspect ratio).
Definition: am7xxx.h:125
More brightness, but more power consumption.
Definition: am7xxx.h:103
Error messages, typically they describe API functions failures.
Definition: am7xxx.h:70
int am7xxx_set_power_mode(am7xxx_device *dev, am7xxx_power_mode power)
Set the power mode of an am7xxx device.
Definition: am7xxx.c:1402
void am7xxx_set_log_level(am7xxx_context *ctx, am7xxx_log_level log_level)
Set verbosity level of log messages.
Definition: am7xxx.c:1163
int am7xxx_get_device_info(am7xxx_device *dev, am7xxx_device_info *device_info)
Get info about an am7xxx device.
Definition: am7xxx.c:1221
int am7xxx_calc_scaled_image_dimensions(am7xxx_device *dev, unsigned int upscale, unsigned int original_width, unsigned int original_height, unsigned int *scaled_width, unsigned int *scaled_height)
Calculate the dimensions of an image to be shown on an am7xxx device.
Definition: am7xxx.c:1269
unsigned int native_width
The device native width.
Definition: am7xxx.h:57
int am7xxx_send_image_async(am7xxx_device *dev, am7xxx_image_format format, unsigned int width, unsigned int height, unsigned char *image, unsigned int image_size)
Queue transfer of an image for display on an am7xxx device and return immediately.
am7xxx_zoom_mode
The display zoom modes.
Definition: am7xxx.h:122
int am7xxx_set_zoom_mode(am7xxx_device *dev, am7xxx_zoom_mode zoom)
Set the zoom mode of an am7xxx device.
Definition: am7xxx.c:1413
Fatal messages, the user application should stop if it gets one of this.
Definition: am7xxx.h:69
Verbose informations about the communication with the hardware.
Definition: am7xxx.h:74
Low power consumption but also low brightness.
Definition: am7xxx.h:101
int am7xxx_send_image(am7xxx_device *dev, am7xxx_image_format format, unsigned int width, unsigned int height, unsigned char *image, unsigned int image_size)
Send an image for display on an am7xxx device.
unsigned int native_height
The device native height.
Definition: am7xxx.h:58
void am7xxx_shutdown(am7xxx_context *ctx)
Cleanup the library data structures and free the context.
Definition: am7xxx.c:1140
am7xxx_log_level
The verbosity level of logging messages.
Definition: am7xxx.h:68
int am7xxx_close_device(am7xxx_device *dev)
Close an am7xxx_device.
Definition: am7xxx.c:1206
struct _am7xxx_device am7xxx_device
An opaque data type representing an am7xxx device.
Definition: am7xxx.h:46
Display is powered off, no image shown.
Definition: am7xxx.h:100